Then select one of the formats to save the file.įinally check if the Excel file can be opened successfully. For Excel 2010 or the higher versions, click File > Export > Change File Type option.
It's easy to achieve this aim, click the 'Microsoft Office' button and choose Excel Options in Excel 2007. You can change the default file format to any other formats the Excel supports. There is a few chance you encounter the error 'Excel file extension not valid' due to the incompatible file extension. Change the Default File FormatĪs we know, the Excel file is saved in XLS format in Excel 2003 and earlier versions, while the later versions start to use XLSX to save the file. Uncheck the add-ins in the pop-up box and then click OK.Īs for removing the add-ins, you need to uninstall the add-in through Control Panel or Settings. Select Excel Add-ins in the Manage box and click Go.ģ. You can see all active or inactive application add-ins in the Add-ins list. In the pop-up window, click Add-Ins category.Ģ. You can follow the below steps to remove or disable the add-in in Excel:ġ. If you can open the files in safe mode, there is an chance that one of the add-ins prevent the Excel file from opening. In some case, a few add-ins you installed may cause this kind of issue. Save the file as a web page and reopen it as an Excel file.
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